Engine port construction



June 30, 1931. o. H. SPENCER 1,812,379

ENGINE PORT CONSTRUCTION Filed May 5, 1929 2 Sheets-Sheet l June 30, 1931. o. H. SPENCER ENGINE PORT CONSTRUCTION Filed May 3, 1929 2 Sheets-Sheet FIG. 2.

Patented June 33, 1931 uaur n stares rarsnr orrica OWEN H. SPENCER, OF INDIANAPOLIS, ILDIANA ENG-ENE PORT Application filed May 3,

that certain'ones thereof will overlap the intake ports so that the exhaust ports will extend more than one half the circumference of the cylinders, while the intake ports will be limited to substantially one half the circumference of the cylinders.

ther objects and advantages will be hereinafter more fully set forth and pointed out in the accompanying specification.

In the accompanying drawings which are made a part of this application,

Figure 1 is a vertical central sectional View through an internal combustion engine, with the piston shown in its extreme inward posi tion.

Figure 2 is a sectional View thereof as seen on line 2-2'Fig. 1, and,

Figure 8 is a similar View as seen on line 33, Figure 1.

Referring to the drawings, in which similar reference characters designate corresponding parts throughout the several views, the numeral 1 indicates the cylinder of an internal combustion engine, in which is reciprocatingly mounted a piston 2, of the conventional form, said piston being operated within the cylinder by means of a crank shaft 3. V

The wall of the cylinder 1 is provided in its lower portion with one or a plurality of exhaust ports 4, which extend more than one halfthe circumference of the cylinder, thereby providing sufficient exhaust opening through which the exploded heated gases may more quickly escape from the cylinder, than is possible with the present construction of cylinders.

The lower portion of the cylinder 1 is also provided with inlet ports 5, which also extend. circumferentially of the cylinder and I *esimately cnehalf the diameter of the CONSTRUCTION 1929. Serial at. 360,273.

cylinder, and the exhaust ports extend more than one half the diameter of the cylinthat portion of the exhaust ports 4, proectmg beyond the circumferential center of nder, lie in a pl above t 19 inlet aaraiod therefrom by wall 6. ,1 ll -l 1 m 1: i 18 GP CL gen 0.]. Jii i410 cnilalleo ports (are pref r ly in line with each other so that they u in all he uncovered simultaneously on the downward stroke of the piston 2, thus permitting the exhaust gases to enter all the exhaust ports substantially at the same time, and due to the multi 'ilicity of the exhaust ports, the gas will rapidly leave the cylincer.

On the cont nued downward stroke of the piston 2, the inlet ports 5 will he uncovered, thus admitting fresh gaseous charge, the top end of the piston having battle 7 thereon, so arranged that the incoming charge of gas will be directed upwardly in the cyl :der and be thus prevented from passing directly to the exhaust ports l.

By providing the extended exhaust area, practically all the heated exhaust material will escape from the cylinder after each explosion, without delay, thus not only giving immediate room for he new charge, but also aiding in keeping the temperature of the cylinder at a comparatively low degree. By this arrangement the fumes from the explosive fumes are eliminated from the engine hefore any residue deposits collect within same such as carbon.

It will also be seen that the cylinder, the same as is commonly used, with the exception of the passage 8 into which the exnaust passes from the cylinder, such passage lacing somewhat enlarged to cooperate with the increased nuinher of exhaust ports used.

What I claim is:

In an internal combustion engine, a cylinder, exhaust ports through the wall of said cylinder encircling substantially one half the circumference of said cylinder, additional exhaust ports around a portion of the remainder of the circumference of said cylinder and of a height less than the height of the first exhaust ports, an escape passage common to all of said exhaust ports, intake ports independent of the exhaiiisz'; ports also encircling substantially one half the eireumference of the cylinder and underlying the shorter exhaust ports and at that side of the cylinder oppositesaid escape passage, and solid Walls entirely and permanently separating the intake ports from the exhaust p ortsfivhereby the contents ef-theint eke ports must pass into the Cylinder before entering or contacting with any of the exhaustports.

In testimony whereo fil have hereunto set my hand on this the 2nd day of May, 1929,

A. D. I I 7 [OWEN H. SPENCERJ 

